KR100383543B1 - Laser System for Alignment Optical Axis of Multiple Transmitter - Google Patents

Abstract

The present invention relates to a laser system capable of aligning the optical axis of a plurality of transmitters, and to easily overcome the difficulty of aligning an accurate optical axis, which is a problem caused by the conventional plurality of transmitters.

According to the present invention, a laser driver and a main body having a predetermined shape and size are provided, and a laser diode connected to the laser driver is provided in the main body, and a plurality of transmitters are provided with negative lenses, single lenses, and double lenses, respectively. A laser system, comprising: a wedge case which is joined to one side of the main body; An outer case joined to an outer surface of the wedge case; A wedge lens unit provided with a plurality of wedge-type lenses rotatably inside the wedge case; The configuration is made, including.

The present invention configured as described above can easily and quickly perform precise optical axis alignment of a plurality of transmitters, thereby improving the reliability of the laser system.

Description

Laser System for Alignment Optical Axis of Multiple Transmitter

The present invention relates to a laser system, and more particularly, to a laser system capable of aligning optical axes of a plurality of transmitters so that the alignment of optical axes can be more easily and precisely performed in a laser system having a plurality of transmitters. .

In general, transmitters and receivers correspond to RF modules and antennas of a microwave system in a wireless optical communication device using laser light. The transmitter emits modular laser light, and the receiver is an instrument, optical and electronic circuit that collects the received optical signal and converts the optical signal into an electrical signal.

Unlike microwave systems, laser communication has a limited reception sensitivity of the receiver. In addition, since the band of the signal received by the receiver is a terahertz ultrafine fiber, the air environment, dust, fog, temperature gradient, moisture gradient, etc. It is greatly influenced by non-uniform mediators in the passage that caused this. This non-uniform medium in the passage causes the refraction of light, causing a bit error or frame loss, thereby reducing the reliability of the laser system. Looking at, as shown in the accompanying drawings, Figure 4, for example, when describing a single transmitter, a receiver 100 for receiving the incident laser light and converting it into an electrical signal, and the receiver 100 in front It consists of a front panel 110 to be fixed, and a transmitter 120 mounted on the front of the front panel 110 to convert an electrical signal according to the data into a laser light signal for transmission. And one transmitter 120. Here, looking at the specific structure of each receiver and transmitter, as shown in FIG. 5, first, the receiver 100 is provided with a photodiode 101 on the left side of the drawing, and an optical filter 102 is provided next to it. . The receiver lens 103 is provided on the right side with a predetermined interval. The transmitter 120 includes a laser diode 121, a negative lens 122, a single lens 123, and a double lens 124, respectively. The laser system having such a single transmitter has to be processed and assembled by an accurate instrument and an optical design, and a slight error occurs in the fabrication of the instrument, assembly of the lens, and final assembly. to be. However, when a change in the optical axis of the conventional transmitter 120 is caused by such an error, the position of the photodiode 101 of the receiver 100 is adjusted to adjust the position as much as the optical axis of the transmitter 120 is changed. However, the error can be corrected to some extent. However, in the case of a single transmitter, as shown in FIG. 6, the shape of the effective beam emitted from the laser diode 121 is an ellipse having a long top and bottom and a short left and right. Is formed. If this type is applied as it is, the width of the left and right directions is narrow, so there is a danger that the optical axis will escape from the receiver of the separate laser system installed opposite to a certain distance due to the change of environment during or after the adjustment of the optical axis. Doing. For example, the scattering and refraction of the beam are caused by the bending of the atmosphere due to the temperature difference, and in the case of wind and high-rise buildings, the optical axis is changed by the flow of the building itself. The risk of escaping is with the drawbacks that increase.

In addition, when the ultrafast laser system is to be implemented, the laser energy received per pulse must be maintained above a certain level in order to operate a stable system. However, the laser system of one powerful laser power (single transmitter) not only has a limitation of output energy but also has a high power laser diode 121 as a light source for long-distance transmission. Staring directly at the light source during installation can cause serious eye safety problems (such as damage to the retina). Therefore, there was a problem that requires special care and protective equipment.

The scintillation caused by the problem of refraction of light caused by non-uniform mediators in the path generated when the laser light penetrates the atmospheric space and the level of laser energy received per pulse required in the ultrafast laser system. To maintain, the use of a laser system with multiple transmitters is essential. However, in order to implement a laser system using a plurality of transmitters, an accurate alignment of the optical axes of the plurality of transmitters must be developed. In the past, a laser system having such a plurality of transmitters has been developed. As shown in FIG. 7, the receiver 200 is located at the center, and four transmitters 210 are provided around the receiver 200. The periphery of the front panel 220 is provided. The structure of the receiver 200 and the four transmitters 210 has the same structure as in the case of the single transmitter type described above, and has only four, not one. Therefore, a detailed description of the structure is omitted. As shown in FIG. 8A, beams are diverged through the plurality of transmitters 210, each beam is added to secure a wider space. This solves the problem of the single transmitter. However, when the plurality of transmitters 210 are used in this way, when an error occurs in the optical axis of each transmitter and the optical axis is not constant, the degree of change in the optical axis of each transmitter is different, the receiver 200 It should be satisfied that the photodiode of is aligned with the optical axis of either transmitter. In this case, the optical axis of the transmitter provided at another position does not coincide with the optical axis of the receiver 200. As a result, as shown in FIG. 8 (b), the error of each transmitter is attached as much as the change in the optical axis. As a result, the transmitter does not have any influence on the communication by moving away from the center, thereby failing to properly utilize the advantages of the plurality of transmitters. There was this.

In other words, a laser system using a plurality of transmitters has a much more stable and superior performance compared to a single transmitter in a laser system, but it is difficult to implement a technology that can easily align accurate optical axes. It has been difficult to commercialize until now.

Accordingly, the present invention has been invented to solve the above conventional problems, to provide a laser system capable of aligning the optical axis of a plurality of transmitters to realize accurate and rapid alignment of the optical axis of the plurality of transmitters. There is a purpose.

1 is a cross-sectional view showing a transmitter to which a wedge-shaped lens according to the present invention is applied

2 is an explanatory diagram showing a traveling direction of light by the wedge-shaped lens according to the present invention

FIG. 3 is an explanatory view showing a light propagation direction by a wedge-shaped lens disposed differently from that of FIG. 2. FIG. 4 is a schematic front view of a laser system having a conventional single transmitter. FIG. 5 is a detailed structure of FIG. 6 is a schematic front view of a laser system having a plurality of transmitters. FIG. 8 (a) shows a beam distribution by a plurality of transmitters. 8 (b) is an explanatory diagram showing a phenomenon caused by misalignment of optical axes in a plurality of conventional transmitters.

* Explanation of Signs of Major Parts of Drawings *

10: laser driver

20: main body

22: laser diode

30: negative lens

32: single lens

34: Double Lens

40: wedge case

41: adjuster

42: screw fixing hole

50: outer case

60: wedge case

61: Holder for Wedge

62: wedge type lens

63: retaining ring

70: spacer ring

80: wedge case fixing ring

The present invention for achieving the above object is provided with a laser driver and a main body having a predetermined shape and size, the main body is provided with a laser diode connected to the laser driver, a negative lens, a single lens, a double lens is provided respectively A laser system having a plurality of transmitters, the laser system comprising: a wedge case joined to one side of the main body; An outer case joined to an outer surface of the wedge case; A wedge lens unit provided with a plurality of wedge-type lenses rotatably inside the wedge case; It is made with a technical feature including.

The wedge lens unit is characterized in that it comprises a wedge holder, a wedge-shaped lens fitted in the wedge holder, and a retaining ring that is screwed and fixed to one side of the wedge-shaped lens.

The wedge-shaped lens is characterized in that it is fitted in the wedge-shaped holder.

The upper surface of the wedge case is characterized in that a plurality of adjustment holes are formed for rotating the wedge holder, respectively, in accordance with the wedge holder for each wedge lens unit provided therein.

The lower surface of the wedge case is characterized in that a plurality of screw fixing holes are formed.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a transmitter (T) equipped with a wedge-shaped lens according to the present invention. As shown, the left side of the drawing is equipped with a laser driver 10 and the main body 20 having a predetermined shape and size. In the main body 20, a laser diode 22 connected to the laser driver 10 is provided, and a negative lens 30, a single lens 32, and a double lens 34 are respectively provided.

In addition, the wedge case 40 is screwed to one side of the main body 20, and the outer case 50 is screwed to the outer surface of the wedge case 40.

A plurality of wedge lens units 60 are provided in the wedge case 40. The wedge lens unit 60 includes a wedge holder 61, a wedge-shaped lens 62 fitted into the wedge holder 61, and a retaining ring that is screwed onto one side of the wedge-shaped lens 62. 63).

In addition, a spacer ring 70 is provided between the wedge lens units 60. In addition, the wedge case fixing ring 80 is installed on the outermost side of the inside of the wedge case 40, that is, on the right side of the drawing.

In addition, the upper surface of the wedge case 40, the adjustment hole 41 is formed in accordance with the wedge holder 61 of each wedge lens unit 60 provided therein. In the present invention, two adjustment holes 41 are shown for convenience, but are not limited thereto.

In addition, a plurality of screw fixing holes 42 are formed on the lower surface of the wedge case 40 to fix the wedge lens unit 60 provided in the wedge case 40 through a screw (not shown). will be.

The wedge-shaped lenses 62 have a narrow surface and a relatively wide surface in cross section, and are arranged side by side.

If they are combined to form a rectangle, that is, when the narrow and wide surfaces are located in opposite directions, the plane plate becomes a plane plate so that the direction of light does not change.

In the drawings, reference numerals P, P 'denote points, Θ' and Θ ″ denote division angles, and 90 denote lenses.

In the present invention configured as described above, the light emitted from the laser diode 22 passes through the wedge-shaped lens 62 of the wedge lens unit 60 through the negative lens 30, the single lens 32, and the double lens 34. Done.

If the optical axes of the plurality of transmitters are aligned in parallel with respect to the optical axes of the laser system, the wedge-shaped lenses 62 of each transmitter may be rotated.

That is, through the adjustment hole 41 formed in the upper portion of the wedge case 40 rotates the wedge holder 61 disposed therein in one direction. At this time, the screw fixed in the lower portion of the wedge case 40 in advance to loosen the screw slightly to maintain a loose state, then rotate the wedge holder 61 as described above.

After rotating as much as desired in one direction, the screw loosened again is tightened again to fix the wedge holder 61 inside the wedge case 40.

This changes the direction of light, as shown in FIG. 2 or FIG. 3, which has the same effect as physically moving the laser diode 22 to point P (P ′). The degree of switching in the direction of and the direction of switching are determined by the relative rotation of the two wedge-shaped lenses 62.

This wedge-shaped lens 62 enables a precise alignment within 20 'of the division angle Θ' (Θ ") from the optical axis, resulting in a parallel of light of a plurality of transmitters, resulting in uniform density and high intensity in farfield. The beam spot can be implemented.

As described above, the present invention can adjust the deviation within 20 'from the optical axis, thereby enabling precise alignment of a plurality of transmitters, achieving uniform laser energy density distribution in farfield, and passing radio waves with nonuniform media. Since scintillation that can occur can be minimized, the reliability of the laser system can be improved.

In addition, accurate optical axis adjustment of the transmitter enables the use of multiple transmitters rather than a single transmitter, while maintaining the transmitter energy below a certain level while meeting the high energy per pulse required by the high speed laser system and the probability of system failure. Can be minimized.

In addition, the simple structure makes the price cheaper, it is possible to effect such as rapid precise optical axis alignment.

Claims (5)

A laser driver 10 and a main body 20 having a predetermined shape and size are provided. The main body 20 is provided with a laser diode 22 connected to the laser driver 10, and includes a negative lens 30 and a single unit. In the laser system having a plurality of transmitters T, each of which has a lens 32 and a double lens 34, A wedge case 40 screwed to one side of the main body 20; An outer case 50 which is joined to an outer surface of the wedge case 40; Laser system capable of aligning the optical axis of the plurality of transmitters, characterized in that it comprises a wedge lens unit 60 is provided with a plurality of wedge-shaped lenses 62 rotatably inside the wedge case 40, respectively. . The method of claim 1, The wedge lens unit 60 includes a wedge holder 61, a wedge-shaped lens 62 fitted into the wedge holder 61, and a retaining ring that is screwed into and fixed to one side of the wedge-shaped lens 62. Laser system capable of aligning the optical axis of the plurality of transmitters, characterized in that it comprises a (63). The method according to claim 1 or 2, And the wedge-shaped lens (62) is fitted in a wedge holder (61). The method of claim 1, A plurality of adjustment holes 41 are formed on the upper surface of the wedge case 40 to rotate the wedge holder 61 in accordance with the wedge holder 61 of each wedge lens unit 60 provided therein. Laser system capable of aligning the optical axis of a plurality of transmitters, characterized in that the. The method of claim 1, The lower surface of the wedge case (40) is a laser system capable of aligning the optical axis of the plurality of transmitters, characterized in that a plurality of screw fixing holes (42) are formed.